The Taliban et al. have already figured all this out. So they don't play this game.
Instead of trying to defeat us by conventional means, they've chosen to give us an autoimmune disease, something like AIDS: First, they damage us slightly via one or more (usually few) terrorist vectors. The initial damage is not particular great, but it causes the rest of the body (i.e. the government and the public) to overreact.
All of the body's defenses (i.e. treasure) are focused on eliminating the agent, but the agent retreats into a place where the autoimmune system is ineffective (i.e. caves). The continuing effort begins to sap the body of energy necessary for maintenance of the rest of itself (education, infrastructure, etc.). Eventually, the body begins to decay such that the nervous system (government) begins to break down and the logical part of the brain begins to fail. Psychosis takes in as the body begins to give in to strong, vacillating emotions.
Eventually, other vital organs begin to fail, leaving it open to opportunistic diseases (massive debt and possibly graft). The final prognosis is not promising.